He's also a regular on Sixty Symbols and he loves talking about the fine structure constant.

Physicist Dr James Clewett is a self-confessed computer game geek.

He is a former world champion Tetris player. More about James at jamesclewett.com

Antonio 'Tony' Padilla is Lecturer in Physics at the University of Nottingham and a Royal Society Research Fellow. His favourite number is 5 because that's how many European Cups Liverpool FC have won.